1/* 2 * Copyright (c) 2000-2007 Apple Inc. All rights reserved. 3 * 4 * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ 5 * 6 * This file contains Original Code and/or Modifications of Original Code 7 * as defined in and that are subject to the Apple Public Source License 8 * Version 2.0 (the 'License'). You may not use this file except in 9 * compliance with the License. The rights granted to you under the License 10 * may not be used to create, or enable the creation or redistribution of, 11 * unlawful or unlicensed copies of an Apple operating system, or to 12 * circumvent, violate, or enable the circumvention or violation of, any 13 * terms of an Apple operating system software license agreement. 14 * 15 * Please obtain a copy of the License at 16 * http://www.opensource.apple.com/apsl/ and read it before using this file. 17 * 18 * The Original Code and all software distributed under the License are 19 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER 20 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, 21 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, 22 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. 23 * Please see the License for the specific language governing rights and 24 * limitations under the License. 25 * 26 * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ 27 */ 28/* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */ 29/*- 30 * Copyright (c) 1982, 1988, 1991, 1993 31 * The Regents of the University of California. All rights reserved. 32 * (c) UNIX System Laboratories, Inc. 33 * All or some portions of this file are derived from material licensed 34 * to the University of California by American Telephone and Telegraph 35 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 36 * the permission of UNIX System Laboratories, Inc. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)systm.h 8.7 (Berkeley) 3/29/95 67 */ 68 69/* 70 * The `securelevel' variable controls the security level of the system. 71 * It can only be decreased by process 1 (/sbin/init). 72 * 73 * Security levels are as follows: 74 * -1 permannently insecure mode - always run system in level 0 mode. 75 * 0 insecure mode - immutable and append-only flags make be turned off. 76 * All devices may be read or written subject to permission modes. 77 * 1 secure mode - immutable and append-only flags may not be changed; 78 * raw disks of mounted filesystems, /dev/mem, and /dev/kmem are 79 * read-only. 80 * 2 highly secure mode - same as (1) plus raw disks are always 81 * read-only whether mounted or not. This level precludes tampering 82 * with filesystems by unmounting them, but also inhibits running 83 * newfs while the system is secured. 84 * 85 * In normal operation, the system runs in level 0 mode while single user 86 * and in level 1 mode while multiuser. If level 2 mode is desired while 87 * running multiuser, it can be set in the multiuser startup script 88 * (/etc/rc.local) using sysctl(1). If it is desired to run the system 89 * in level 0 mode while multiuser, initialize the variable securelevel 90 * in /sys/kern/kern_sysctl.c to -1. Note that it is NOT initialized to 91 * zero as that would allow the vmunix binary to be patched to -1. 92 * Without initialization, securelevel loads in the BSS area which only 93 * comes into existence when the kernel is loaded and hence cannot be 94 * patched by a stalking hacker. 95 */ 96 97#ifndef _SYS_SYSTM_H_ 98#define _SYS_SYSTM_H_ 99 100#include <sys/appleapiopts.h> 101#include <sys/cdefs.h> 102#include <sys/types.h> 103#include <sys/time.h> 104#include <sys/ioctl.h> 105#include <sys/malloc.h> 106#ifdef BSD_KERNEL_PRIVATE 107#include <sys/tty.h> 108#include <sys/vm.h> 109#endif 110#include <sys/proc.h> 111__BEGIN_DECLS 112#ifdef KERNEL 113#include <libkern/libkern.h> 114#endif 115#include <kern/thread.h> 116#include <kern/debug.h> 117__END_DECLS 118 119#ifdef BSD_KERNEL_PRIVATE 120extern char version[]; /* system version */ 121extern const char copyright[]; /* system copyright */ 122 123 124extern int boothowto; /* reboot flags, from console subsystem */ 125extern int show_space; 126 127extern int nblkdev; /* number of entries in bdevsw */ 128extern int nchrdev; /* number of entries in cdevsw */ 129#endif /* BSD_KERNEL_PRIVATE */ 130 131#ifdef KERNEL_PRIVATE 132 133extern int securelevel; /* system security level */ 134extern dev_t rootdev; /* root device */ 135extern struct vnode *rootvp; /* vnode equivalent to above */ 136 137#ifdef XNU_KERNEL_PRIVATE 138#define NO_FUNNEL 0 139#define KERNEL_FUNNEL 1 140extern funnel_t * kernel_flock; 141#endif /* XNU_KERNEL_PRIVATE */ 142 143#endif /* KERNEL_PRIVATE */ 144 145#define SYSINIT(a,b,c,d,e) 146#define MALLOC_DEFINE(a,b,c) 147 148#define getenv_int(a,b) (*b = 0) 149#define KASSERT(exp,msg) 150/* 151 * General function declarations. 152 */ 153__BEGIN_DECLS 154 155#ifdef BSD_KERNEL_PRIVATE 156int einval(void); 157void nullsys(void); 158int errsys(void); 159int seltrue(dev_t dev, int which, struct proc *p); 160void ttyprintf(struct tty *, const char *, ...) __printflike(2, 3); 161void realitexpire(struct proc *); 162int hzto(struct timeval *tv); 163void tablefull(const char *); 164int kvprintf(char const *, void (*)(int, void*), void *, int, 165 __darwin_va_list); 166void uprintf(const char *, ...) __printflike(1,2); 167int copywithin(void *saddr, void *daddr, size_t len); 168int64_t fulong(user_addr_t addr); 169int sulong(user_addr_t addr, int64_t longword); 170uint64_t fuulong(user_addr_t addr); 171int suulong(user_addr_t addr, uint64_t ulongword); 172int vslock(user_addr_t addr, user_size_t len); 173int vsunlock(user_addr_t addr, user_size_t len, int dirtied); 174int clone_system_shared_regions(int shared_regions_active, 175 int chain_regions, 176 int base_vnode); 177extern kern_return_t bsd_exception(int, mach_exception_data_t codes, int); 178extern void bsdinit_task(void); 179extern void unix_syscall_return(int) __dead2; 180void initclocks(void); 181void startprofclock(struct proc *); 182void stopprofclock(struct proc *); 183void setstatclockrate(int hzrate); 184struct time_value; 185void get_procrustime(struct time_value *tv); 186void load_init_program(struct proc *p); 187void __pthread_testcancel(int presyscall); 188void syscall_exit_funnelcheck(void); 189void throttle_info_get_last_io_time(mount_t mp, struct timeval *tv); 190void update_last_io_time(mount_t mp); 191#endif /* BSD_KERNEL_PRIVATE */ 192 193#ifdef KERNEL_PRIVATE 194void timeout(void (*)(void *), void *arg, int ticks); 195void untimeout(void (*)(void *), void *arg); 196int bsd_hostname(char *, int, int*); 197#endif /* KERNEL_PRIVATE */ 198 199int nullop(void); 200int nulldev(void); 201int enoioctl(void); 202int enosys(void); 203int enxio(void); 204int eopnotsupp(void); 205void *hashinit(int count, int type, u_long *hashmask); 206void ovbcopy(const void *from, void *to, size_t len); 207int fubyte(user_addr_t addr); 208int fuibyte(user_addr_t addr); 209int subyte(user_addr_t addr, int byte); 210int suibyte(user_addr_t addr, int byte); 211long fuword(user_addr_t addr); 212long fuiword(user_addr_t addr); 213int suword(user_addr_t addr, long word); 214int suiword(user_addr_t addr, long word); 215#define fusize(_a) ((user_size_t)fulong(_a)) 216#define susize(_a, _s) sulong((_a), (_s)) 217#define fuptr(a) ((user_addr_t)fulong(_a) 218#define suptr(_a, _p) sulong((_a), (_p)) 219int useracc(user_addr_t addr, user_size_t len,int prot); 220typedef void (*timeout_fcn_t)(void *); 221void bsd_timeout(void (*)(void *), void *arg, struct timespec * ts); 222void bsd_untimeout(void (*)(void *), void *arg); 223void set_fsblocksize(struct vnode *); 224uint64_t tvtoabstime(struct timeval *); 225void *throttle_info_create(void); 226void throttle_info_mount_ref(mount_t mp, void * throttle_info); 227void throttle_info_mount_rel(mount_t mp); 228void throttle_info_release(void *throttle_info); 229void throttle_info_update(void *throttle_info, int flags); 230uint32_t throttle_lowpri_io(int sleep_amount); 231void throttle_set_thread_io_policy(int policy); 232 233typedef struct __throttle_info_handle *throttle_info_handle_t; 234int throttle_info_ref_by_mask(uint64_t throttle_mask, throttle_info_handle_t *throttle_info_handle); 235void throttle_info_rel_by_mask(throttle_info_handle_t throttle_info_handle); 236void throttle_info_update_by_mask(void *throttle_info_handle, int flags); 237 238void throttle_legacy_process_incr(void); 239void throttle_legacy_process_decr(void); 240 241/* 242 * 'throttle_info_handle' acquired via 'throttle_info_ref_by_mask' 243 * 'policy' should be specified as either IOPOL_UTILITY or IPOL_THROTTLE, 244 * all other values will be treated as IOPOL_NORMAL (i.e. no throttling) 245 */ 246int throttle_info_io_will_be_throttled(void *throttle_info_handle, int policy); 247 248__END_DECLS 249 250#endif /* !_SYS_SYSTM_H_ */ 251